thumbnail(1)

NAME

       thumbnail - create a TIFF file with thumbnail images

SYNOPSIS

       thumbnail [ options ] input.tif output.tif

DESCRIPTION

       thumbnail is a program written to show how one might use the SubIFD tag
       (#330) to store thumbnail images.  thumbnail copies a TIFF Class F fac-
       simile  file  to  the output file and for each image an 8-bit greyscale
       thumbnail sketch.  The output file contains the  thumbnail  image  with
       the associated full-resolution page linked below with the SubIFD tag.

       By  default,  thumbnail  images are 216 pixels wide by 274 pixels high.
       Pixels are calculated by sampling and filtering the  input  image  with
       each pixel value passed through a contrast curve.

OPTIONS

       -w     Specify the width of thumbnail images in pixels.

       -h     Specify the height of thumbnail images in pixels.

       -c     Specify  a  contrast  curve to apply in generating the thumbnail
              images.  By default pixels values are passed  through  a  linear
              contrast  curve that simply maps the pixel value ranges.  Alter-
              native curves are: exp50 for a 50% exponential curve, exp60  for
              a  60%  exponential  curve,  exp70  for a 70% exponential curve,
              exp80 for a 80% exponential curve, exp90 for a  90%  exponential
              curve,  exp  for  a  pure exponential curve, linear for a linear
              curve.

BUGS

       There are no options to control  the  format  of  the  saved  thumbnail
       images.

SEE ALSO

       tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)

                              September 26, 1994                  THUMBNAIL(1)